Optically heated long-period grating as temperature-insensitive fiber-optic refractive-index sensor

Yebin Zhang, Shaorui Gao, Aping Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


A temperature-insensitive fiber-optic refractive-index sensor based on optically heated long-period grating (LPG) is presented. The LPG is manufactured in a short section of cobalt-doped optical fiber (COF), which can be thermally stabilized through a pump light. Two fiber Bragg gratings (FBGs) are manufactured in COF and single-mode fiber (SMF), respectively, to monitor the local sensor and surrounding medium temperature. Experimental results demonstrate that this fiber-grating-based miniature refractive-index sensor can efficiently eliminate temperature cross-sensitivity in the temperature range of 5 ∼ 60°C.
Original languageEnglish
Article number6387666
Pages (from-to)2340-2345
Number of pages6
JournalIEEE Photonics Journal
Issue number6
Publication statusPublished - 1 Dec 2012


  • fiber-optic sensor
  • long-period grating (LPG)
  • Optical heating
  • refractive-index sensor

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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